Rotating steel file



(No Model.)

J. G. POWELL.

ROTATING STEEL FILE.

No. 426,320. Patented Apr. 22, 1890.

I UNITED STATES PATENT OFFICE.

JAMES C. POW'ELL, OF MACON, GEORGIA.

ROTATING STEEL FILE.

SPECIFICATION forming part of Letters Patent No. 426,320, dated April22, 1890.

Application filed September 9, 1889. $erial No. 323,353. (No model.) 7

T0 all whom it may concern:

Be it known that I, JAMES C. POWELL, a citizen of the United'St-ates ofAmerica, residing at Macon, in the county of Bibb and State of Georgia,have invented certain new and useful Improvements in Rotating SteelFiles, of which the following is a specification, reference beinghadtherein to the accompanying drawings,

This invention relates to certain improvements in filing-machines,having for its object to provide for doing work bymaehinery heretoforedone byhand; and it consists of a lathe or mandrel adapted'to carry afile or files of peculiar construction, as will more fully appear fromthe following description and accompanying illustrations, in whichFigure 1 is a sectional view of my file and the screw-threaded shaft andcenter for securing it in a lathe for rotation. Fig. 2is an enlargeddetail sectional View of the ends thereof. Fig. 3 is a side elevation ofa spindlefile, showing the manner in which the teeth are cut on roundsurfaces. Figs. 4 5, and G are detail sectional views showing myinvention as adapted to files of different shapes.

In carrying out my invention I employ a lathe A, in its general outlineof usual construction and provided with a center a and a screw mandrelor shaft Z) for the support and rotation of a file.

B is a round file provided with a cuttingsurface formed by grooving andeross-grooving the same, and isadapted for filing 01' cutting byrotation and for mounting upon the center a and shaft 6.

O is a oylindric form of file, into the ends of which are inserted plugs0, one having a screw-threaded socket or aperture to receive thescrew-threaded drel b.

In the outer surface of the other plug 0 is a plain socket or recess toreceive the tapered inner end of the center a for mounting the fileaxially in position in the lathe. The plugs 0 may be solid with the bodyof the file when of small size, as shown in the bottom detail views.

Having thus fully described my invention, what I claim, and desire tosecure by Letters Patent, is-

1. In rotating files, the combination of the round body having thefile-cutting surface or face, having the screw-threaded recess at oneend and the center or hearing at its other end, substantially as shownand described.

2. In a rotating 'file, the disk or Wheel havin g file-cuttin g faces,in combination with the screw-threaded shaft and the center, one at eachend, substantially as shown and described.

3. In a rotating file, the wheel or round body having a curved orcircular file-cutting surface, the center, and the shaft for its supportand rotation, substantially as shown and described.

4. In a rotating file, the combination of the file having in one end thescrew-threaded aperture adapted to receive the shaft and the center atits other cnd'for its support and rotation, substantially as shown anddescribed.

In testimony whereof I affix my signature in presence of two witnesses.

JAMES C. POlVlELL.

end of the shaft or man- Witnesses:

ISAAC LOWENTHAL, L. P. IIILLYER.

